Tannenbaum, Donald G., author
Wadsworth/Thomson learning, 2004
Buku Teks
Ziman, John, author
Cambridge University Press, 1994
Buku Teks
Kosso, Peter, author
Cambridge University Press, 1992
Buku Teks
Kymlicka, Will, author
Clarendon Press, 1990
Buku Teks
Williams, Malcolm, 1953-, author
Routledge, 2000
Buku Teks